Oil leak from top of engine - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-16-2013, 07:33 PM   #1
Jeeper
 
Ianbeaulieu's Avatar
 
Join Date: Mar 2012
Location: San Antonio Texas
Posts: 1,449
Oil leak from top of engine

So after driving to the coast my jeep started leaking oil, it looks like it's coming out of one of the three holes on top of the valve cover, and there's a lot of oil in my air intake, any thoughts?

__________________
1987 YJ 4.2L I6 5-Speed, SOA, 1"shackle, Chrome Diff Cover Rear, Lime Green Under Parts
Ianbeaulieu is offline   Quote Quick Reply
Old 06-16-2013, 08:23 PM   #2
Jeeper
 
871kevin's Avatar
 
Join Date: Jul 2012
Posts: 245
Quote:
Originally Posted by Ianbeaulieu View Post
So after driving to the coast my jeep started leaking oil, it looks like it's coming out of one of the three holes on top of the valve cover, and there's a lot of oil in my air intake, any thoughts?
Most likely its from "blow by". On High milage engines the rings get worn and force high pressure air into the crankcase most of the time the PVC circuit can handle it but if its too much it will get into the air filter. Try changing the PVC , and check all vacuum lines. If that's not it then only way to fix it would be a complete engine rebuild.

871kevin is offline   Quote Quick Reply
Old 06-16-2013, 10:11 PM   #3
Jeeper
 
Ianbeaulieu's Avatar
 
Join Date: Mar 2012
Location: San Antonio Texas
Posts: 1,449
Okay thank you, I read on a Cherokee forum that someone switched theirs to a different kind, I don't remember what kind right now
__________________
1987 YJ 4.2L I6 5-Speed, SOA, 1"shackle, Chrome Diff Cover Rear, Lime Green Under Parts
Ianbeaulieu is offline   Quote Quick Reply
Old 06-17-2013, 07:26 AM   #4
Jeeper
 
871kevin's Avatar
 
Join Date: Jul 2012
Posts: 245
Different kind of what?
871kevin is offline   Quote Quick Reply
Old 06-17-2013, 08:41 AM   #5
Jeeper
 
roadyrob's Avatar
 
Join Date: Apr 2012
Location: west palm fla
Posts: 961
with the jeep running remove the oil fill plug, if you have bad blow by you will see it coming out, alot. if it isn't to bad check your pcv hose and see if its plugged, clean it good, replace pcv valve. . next step would be to remove the valve cover and check for sludge buildup, remove any sludge you find, clean the valve cover good especially the baffles. the 4.2 is known for getting a lot of sludge. mine was so bad you could hardly see the valve springs.
roadyrob is offline   Quote Quick Reply
Old 06-17-2013, 12:59 PM   #6
Jeeper
 
Join Date: Aug 2011
Location: north of St.Franisville La.
Posts: 2,046
Send a message via Yahoo to Nubby55
my 1990 with was blowing really bad and it was the head gasket leaking into the oil return, down into the crankcase and blowing oil out every where, I was planning for rebuild when the gasket then blew into the cooling side. changed the head gasket, now no blow by.

Nubby55 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 07:54 AM.



Jeep«, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC